FastAPI 0.138.1 is now available, bringing targeted improvements to developer and AI agent tooling, along with dependency bumps and workflow refinements. This release focuses on making internal information more accessible and streamlining maintenance processes.
Key updates include:
- Refactored Library Skills (PR #15841 by @tiangolo): The internal system for providing agent-friendly information has been overhauled. Library Skills, which surface relevant docs and code context to AI agents, are now more structured and easier to navigate, improving the agentic development experience.
- Simplified pull request workflows (PR #15836 by @tiangolo): Internal CI triggers have been updated to reduce complexity and make the PR workflow more reliable.
- Updated
issue-managerto 0.7.1 (PR #15833 and PR #15831 by @tiangolo): The issue management automation tool has been upgraded, first to 0.7.0 then to 0.7.1, bringing the latest improvements for triaging and managing GitHub issues. - Sponsor configuration update: TestMu is added back to the sponsors list (PR #15830).
- Security workflow update:
zizmorworkflow security checks have been updated (PR #15820 by @tiangolo). - Dependency bump:
pydantic-settingsupgraded from 2.14.1 to 2.14.2 (PR #15799 by @dependabot[bot]).
For developers, the Library Skills refactor is the standout change—it enhances how AI agents and tooling discover relevant FastAPI documentation and code, potentially improving autocomplete, error messages, and AI-assisted development workflows. The other updates ensure the project's internal automation and dependencies remain current and performant.
Source: https://github.com/fastapi/fastapi/releases/tag/0.138.1